704 Biological activity of FLX475, an oral CCR4 antagonist, as monotherapy and in combination with pembrolizumab in advanced cancer by Qingfeng Zhu, Robert Anders, Damian Trujillo, Dirk G Brockstedt, Michael Chisamore, Juraj Adamik, Paul D Kassner, William Ho, Rakesh Kumar Goyal, Adam Grant, Shoji Ikeda, Marvin Au, Denise Nagata, Eugene Lurie, Mohsen Sabouri Ghomi